Here is the **English translation** of the practical application scenarios for **PD-Free Testing (Partial Discharge-Free Testing)**:
1. Factory Testing of Power Transformers/Reactors**
- **Purpose**: Verify the insulation performance of high-voltage transformers/reactors under rated voltage to ensure no insulation degradation caused by partial discharge (PD).
- **Scenarios**:
- Insulation strength testing between transformer windings and core.
- Detecting internal voids, oil-paper insulation defects (e.g., moisture, impurities).
- Insulation system verification for UHV (Ultra High Voltage) transformers (e.g., ±800 kV DC transformers).
2. Insulation Testing of High-Voltage Cables and Accessories**
- **Purpose**: Ensure cable joints, terminations, and other accessories are free from PD-induced breakdown risks during long-term operation.
- **Scenarios**:
- Acceptance testing after cable installation (e.g., underground cables, submarine cables).
- Detecting micro-pores, mechanical damage, or uneven semi-conductive layers in cable insulation.
- Voltage ratings: 10 kV–500 kV, especially for cross-linked polyethylene (XLPE) cable systems.
3. GIS (Gas-Insulated Switchgear) and Circuit Breaker Testing**
- **Purpose**: Validate the SF6 gas insulation performance of GIS to avoid failures caused by PD.
- **Scenarios**:
- Insulation testing of GIS busbars, disconnectors, and earthing switches.
- Detecting metal particles, insulator cracks, or assembly errors causing discharge.
- Applicable to transmission systems of 110 kV and above.
4. Insulation Verification for Renewable Energy Equipment**
- **Purpose**: Ensure insulation reliability of wind power/photovoltaic equipment (e.g., wind turbines, inverters, pad-mounted substations) in harsh environments.
- **Scenarios**:
- Humidity-resistant insulation testing for offshore wind farm step-up transformers.
- Analyzing discharge characteristics of PV inverter high-voltage insulation materials.
- Detecting insulation stress issues caused by frequent switching or harmonics.
5. Traction Power Supply System Testing for Electrified Railways**
- **Purpose**: Guarantee safe operation of traction transformers and catenary insulators under high load.
- **Scenarios**:
- PD detection in traction transformers under 25 kV AC power supply.
- Insulation performance verification of catenary insulators in high-humidity/dusty environments.
- Preventing traction system tripping or train shutdowns due to discharge.
6. Research and Development of New Insulation Materials**
- **Purpose**: Evaluate discharge characteristics of novel insulation materials (e.g., nano-composites, eco-friendly gases).
- **Scenarios**:
- Laboratory simulation of PD thresholds under extreme voltages.
- Comparing traditional epoxy resins with new eco-friendly insulation materials.
- Providing test data for revisions of IEEE, IEC, and other international standards.
**7. Preventive Maintenance of Power Equipment**
- **Purpose**: Regularly inspect insulation conditions of operational equipment to identify latent defects.
- **Scenarios**:
- Annual insulation testing of substation transformers and capacitors.
- Detecting insulation aging (e.g., oil-paper carbonization) in aging equipment.
- Preventive replacement of high-risk equipment to reduce unplanned outages.
**8. HVDC (High-Voltage Direct Current) System Testing**
- **Purpose**: Ensure insulation stability of DC cables and converter transformers under continuous DC voltage.
- **Scenarios**:
- Long-term PD analysis of ±500 kV/±800 kV DC cables.
- Performance verification of valve hall insulators in high-altitude or polluted environments.
- Addressing space charge accumulation issues in DC electric fields causing PD.
**9. Aerospace and Military Equipment Testing**
- **Purpose**: Ensure fail-safe insulation for electrical equipment in high-reliability scenarios.
- **Scenarios**:
- PD detection in aircraft high-voltage distribution system insulation materials.
- Anti-extreme-environment insulation testing for military radars and shipboard power systems.
- Insulation life assessment of nuclear plant safety-grade transformers.
Application Scenario:
The Smart Displacement Current and Capacitance Tester is designed for field engineers and maintenance professionals engaged in the testing of power systems, particularly in substations and distribution networks. It is ideal for real-time measurement of capacitive current, system grounding conditions, and zero-sequence voltage (3U₀) under various PT (Potential Transformer) wiring configurations, including 3PT, 4PT, and 1PT setups.
Thanks to its wide measurement range, fast response, and intuitive interface, the device is especially suited for:
Detecting abnormal capacitance currents in high-voltage systems
Verifying system grounding effectiveness
Monitoring insulation performance in cable lines and transformers
Troubleshooting early-stage faults or insulation degradation
Supporting routine diagnostic and preventive maintenance in substations
Its compact, lightweight design, combined with high-accuracy digital signal processing and multi-protection circuits, makes it an indispensable tool for power utility companies, substation operators, and electrical equipment manufacturers.
The AC Withstand Voltage Test Device is widely used in power system equipment testing, including transformers, switchgear, insulators, bushings, cables, and electrical components. Its intuitive 7-inch touch screen (optional 10-inch), fully digital calibration, and automatic/manual test modes make it suitable for both field and laboratory environments.
With real-time display of voltage, current, and status, as well as intelligent safety reminders and result judgment, the device ensures fast and accurate dielectric strength tests. It is ideal for:
Factory routine testing of high-voltage apparatus
On-site commissioning of substations and power stations
Preventive maintenance in power grid companies
R&D and lab testing in electrical equipment manufacturing
High-voltage insulation performance validation after repairs or overhauls
The system enhances safety and efficiency with voice alarms, flashing high-voltage warnings, password-protected settings, and multi-device compatibility, offering a modern solution for high-voltage withstand testing needs.
**Product Introduction: Handheld Capacitive Current Tester**
In China's power systems, ungrounded neutral points are common. Single-phase ground faults generate capacitive currents from line-to-ground capacitance, often causing arcing that leads to system failures. Regulations require arc suppression coils when capacitive currents exceed 30A (10kV) or 10A (35kV), necessitating accurate measurement. Additionally, stray capacitance combined with PT parameters may trigger dangerous ferroresonance overvoltages, requiring precise capacitance measurement for risk assessment.
Traditional methods (e.g., direct single-phase grounding, external capacitance injection) involve high-risk operations on primary equipment, with complex procedures and low efficiency. Modern PT secondary-side signal injection avoids these risks by applying low-level out-of-band signals to the PT open delta terminals, eliminating interference with protection systems or PT operations while bypassing 50Hz noise. However, existing instruments are bulky and inconvenient for fieldwork.
Our company has developed a new generation of handheld capacitive current testers, miniaturized through advanced design. Key features include:
- **Compact & Portable**: Redesigned hardware with ARM processor and high-speed ADC reduces size/weight for easier field use.
- **Efficient Measurement**: Integrated digital frequency conversion inverter combines dual-frequency signals into one waveform; Fourier analysis extracts amplitude/phase data in a single test, improving efficiency.
- **Enhanced Accuracy**: New algorithms address measurement errors in 4PT configurations, ensuring precision.
- **Safe & Non-Intrusive**: No direct connection to primary equipment; signals injected via PT open delta terminals ensure safety and compliance.
This tester solves limitations of traditional methods, offering safer, faster, and more reliable capacitance and current measurements for modern power systems.
---
**Key Improvements Over Previous Models:**
- Smaller size and lighter weight for portability.
- All-digital variable-frequency power supply and optimized signal processing.
- Simultaneous dual-frequency analysis for one-step measurement.
- Specialized algorithms for 4PT configuration accuracy.
Ideal for routine maintenance and fault diagnosis in 10kV/35kV networks, ensuring compliance with arc suppression requirements and ferroresonance risk assessment.
Application Scenarios of KDCJ-20Z Touchscreen Intelligent Impulse Withstand Voltage Tester**
The **KDCJ-20Z Touchscreen Intelligent Impulse Withstand Voltage Tester** is a high-precision instrument designed to perform full-wave lightning impulse voltage tests on various power equipment. It is widely used in the fields of power systems, electrical equipment manufacturing, scientific research institutions, and quality inspection departments. Below are its main application scenarios:
1. **Power Transmission and Distribution Equipment Testing**
- Used to evaluate the insulation performance of transformers, circuit breakers, insulators, switchgear, and other high-voltage equipment under simulated lightning conditions.
- Ensures that equipment can withstand transient overvoltages caused by lightning strikes or switching surges.
2. **Electrical Equipment Manufacturing and Quality Control**
- Applied in production lines and R&D labs for testing new products' dielectric strength.
- Helps manufacturers comply with international standards (e.g., IEC) and improve product reliability and safety.
3. **Research and Development in Electrical Engineering**
- Utilized by universities and research institutes for studying insulation materials, protective devices, and high-voltage technologies.
- Provides accurate and repeatable impulse waveforms for experimental analysis.
4. **Preventive Maintenance and Field Testing**
- Deployed by utility companies and maintenance teams to assess the condition of aging equipment in substations and transmission lines.
- Ensures long-term operational safety and reduces the risk of unexpected outages.
5. **Certification and Compliance Testing**
- Employed by testing laboratories to conduct standardized lightning impulse tests required for product certification (e.g., CE, UL, IEC).
- The built-in waveform evaluation algorithm ensures compliance with international test standards.
6. **Training and Educational Institutions**
- Used in technical training centers and educational institutions to teach students about high-voltage testing techniques and insulation coordination principles.
7. **Special Industrial Applications**
- Applied in industries such as rail transit, oil & gas, and renewable energy where high-reliability electrical systems are critical.
- Ensures that control systems, converters, and protection devices can withstand harsh electrical environments.
With features like touchscreen control, integrated waveform display, database management, and fast discharge protection, the **KDCJ-20Z** provides a safe, efficient, and user-friendly solution for high-voltage impulse testing across a wide range of applications.
Performance Description
Instructions for each button:
1. Actual measured current value display
2. Actual temperature value display
3. Ta burning time, also known as test time
4. Ti ignition time, which is the time from the test to the ignition of the specimen
5. Te extinguishing time, which is the time from the test to the extinguishing of the specimen
6. The test time is set to 30 seconds according to the standard. If there are different requirements, please set them separately
7. The experimental temperature is set to 960 ℃ according to the standard. If there are different requirements, please set them separately
8. Heating switch
9. Test start switch
10. Test stop switch
11. Record the ignition time switch (when the test piece is ignited and pressed)
12. Record the extinguishing time switch (pressed when the specimen is extinguished)
The high-voltage circuit breaker running in test system is designed for the running in test of high-voltage circuit breakers. It can simultaneously control the running in test of six circuit breakers. The parameter setting is intuitive, the timing control is simple, and the work efficiency is improved. The control ability of using time relays for running in avoids the disadvantage of burning out the opening and closing coils, effectively protecting the integrity of the circuit breakers. The KDGK-MH high-voltage switch running in test system is easy to operate and is a commonly used tool for circuit breaker design and testing.
500A 1000A 2000a high current generator transformer ratio test temperature rise test device
The KD305Y insulation resistance tester is required to conduct a series of insulation performance tests on numerous power equipment such as cables, motors, generators, transformers, transformers, high-voltage switches, lightning arresters, etc. The first step is to conduct insulation resistance tests. In recent years, with the rapid development of the power industry, the use of large capacity equipment has been increasing, and its insulation performance cannot be detected by ordinary megohmmeters.
Product Overview The pocket-sized lightning strike counter tester is a product meticulously designed and developed by our company's relevant technicians in
It is applicable to measuring the resistance values of various insulating materials and the insulation resistance of transformers, motors and electrical equipment, etc.
It is mainly used to conduct insulation strength tests on various electrical products, electrical components, insulating materials, etc. under specified voltages, in order to assess the insulation level of the products, discover insulation defects of the test samples, and measure the ability to withstand overvoltage.
The KDZR-ZL conductive shoe DC resistance tester is used to measure the resistance of conductive shoes for power safety tools.
The KDZD902A surface resistance measuring instrument for shielding suits is a dedicated device for measuring the surface resistance of shielding suits used in live working.
The KDZD902 shielding suit resistance tester is a product for the factory tests, handover tests and preventive tests of semi-finished and finished shielding suits by power departments. It can effectively detect manufacturing defects such as material selection, workmanship, loose connection parts, missing strands and broken wires of shielding suits, as well as potential hazards after they are put into operation.
